Sudoku #h644

Sudoku game, level: Hard #644. This Sudoku have 25 given numbers (clues)..
Structure: 1 (1 pcs.), 3 (2 pcs.), 2 (2 pcs.), 9 (3 pcs.), 7 (3 pcs.), 5 (3 pcs.), 6 (3 pcs.), 4 (4 pcs.), 8 (4 pcs.), ∑25.


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9  
DEL  
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5
8
7
7
3
9
8
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4
7
9
5
8
3
9
2
6
6
1
4
5
8
4
6
4
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